System Peripherical Interface (SPI) board - Includes the rear panel NIC (2x), iLO2, dual USB, serial port, VGA, keyboard and mouse connectors, plus BBWC cache module connectors, and the system RTC battery

NOTE: SPI board includes an embedded Smart Array P400i SAS Controller and the cache memory module.

1 - Smart Array Cache Memory Module 
2 - Embedded Smart Array P400i SAS Controller 
3 - System CMOS and RTC Battery